Blow-off valve.



Patented Oct. 11, 1910.

1| 0 w 2 v r WW 2 9M. W M 3 09 F. P. HAMILTON.

BLOW-OFF VALVE.

APPLICATION FILED DBO.12, 1905 A1" TE 5'1" sists in a blow ofi' valve provided with vented and wire drawing or cutting of the vide means to apply more or less rotary quires without removing the valve from its the valve and all its operating parts whereby the valve is obtained and especially in the is a side elevation of the valve, and Fig. 2

Fig. 1. Fig. 3 is a perspective view of the valve stem, and Fig. 4 is a perspective view of the valve disk.

'right angled elbow with a central through which is intersected by inlet passage or side o hiive flanges wherewith a bolted connection miner. HAMIE'roN, or ennvnLhun; care.

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Application as December 12,1905. Serial No. 291,483.

means adapted to regrind the valve seat members within the valve itself, all substantially as hereinafter shown and described and more particularly pointed out in the claim. v

When foreign matter, such as scale or sedimentary deposits, lodges upon the valve seat complete closing of the valve is preseat is the result.

. The object of my improvement is to pro pressure to the valve disk independent of its usual seating screw and wherebysuch deposits are ground to powder or bro en up so finely that perfect seating of the valve is obtained. The valve itself may also thus be ground to make its own seat and this may be done from time to time as occasion reconnections and during the time it is under full boiler pressure.

Secondary to. the above, but important nevertheless, is the detail construction of certain advantages in the use and life of convenience and saving of time in making repairs, all as hereinafterset'forth.

In'the accompanying drawings, Figure 1 is a central sectional view at-right angles to Body A oi the valve is in the form of a passage or openin 2 from top to bottom enmg 3. The ends of the elbow portions -i is made to like fittings on the steam line (not shown), but screw threaded connect/ions may be employed instead. Passage 2 is con tracted at its outlet end 5 and enlarged atits opposite end 6 over and above its central portion- 7 wherein the tubular seat me B-is iemovably held by friction when driven in place from above. Qpening I has slightly flaring walls widest at its top and seat meet her 8 1s tapering in tire same degree to give awedgi-ng fit, and when said member worn beyond repair may be removed. a suitable bar or "rare inserted fi cnrheiow and which is adapted to engage inwardly extending in "s 9 on the bottom end of mem ber 8, and w ichlugs are necessary for this purpose in view of the contracted outlet opening 5.

Valve their. 13 has a tapering or cone shaped end 1.0 adapted to seat within the flaring seat or mouth 12 of the thimble memher 8, and is removably supported upon.

head 13 oi operating valve stem let. Valve B is dish shaped and has a ginoved or rah beted recess and side slot 15 at its top adapted to receive the partly'circular and partly rectangular head 13 and whereby rotation to disk B is imparted. This detachable connection of disk-B with stem let allows the re-- laceznent of old and worn out valve disks y new ones.

Valve stem 14': is supported to revolve within a sleeve 16 threaded-in standard 17 of the packing head 18 which is boltedto the top of body A. A pairoi arms 19 form part of hanger l7 and head 18, and a suitable recess or stufling box. 20 in head 18 about stem 1% is filled with packing 21 which is compressed and held in'place by the male member 22 of the stufling box on cross head 23. Two of the bolts used to secure head 18 upon body A have threaded extensions 24 passing through openings in cross head 23,

and nuts 25 secure said cross head adjustably in place. Stem 14 provides an annular shoulder or seat 27 for has a reduced upper end 26 which a steel collar 28 having a race upon its upper face opposedto arace within the opposite end of sleeve 16 and between. which suitable balls 29 are seated to take up'the end thrust when sleeve 1 is rotated by its operating wheel 30 to carry valve disk 8 to its seat. A second collar 31 with ball bearings '32 between it and the upper end. of sleeve 16 llfl - ofl valve but has been so described because rotary action to disk'B is positively obtained in the rig 1: direction.

is inned to the outer end of valve stem 14, and serves to hold all the bearing parts in the end thrust to carry the valve away from its seat. I

In' operation, the valve is opened and closed by rotating wheel 30 and its attached sleeve 16, and in this operation valve disk B and stem 14 may or may not rotate. If deposits prevent perfect closure of the valve a by rotatin stem 14 by means of a wrench or other suita le engaging device adapted to fit over. the angular end 34 of said stem. As grinding continues, and whenever occasionrequires, a gradually increasing pressure may be brought to bear upon the valve seat orthe de os'lt thereon by rotating wheel 30 The device is notlimited solely to a blow of its peculiar adaptability to that class of valves. Therefore, the claim is to be construed to read on other forms of valves than i as shown and described.

What I- claim is i The main body and the valve adapted to be seated therein having a cylindrical stem of different diameters and collars seated upon the smaller ortion of said stem and an operating sleeve or said stem between said collars, in combination with a packing head having a stuflin box for said stem projecting into said b0 y, and a threaded standard for said sleeve integral with but apart from said head upon its outside, a cross head having a follower for said stufiing box and bolts to secure said packing head to the b0d and nuts to adjustably secure said cross beads upon said bolts.

In testimony whereof I sign this specification in the presence of two witnesses. 1

' FRANK P. HAMILTON. Witnesses:

H. T. FIsHnR, R. B. Mosnn. 

